Nonlinear Degenerate Oblique Boundary Value Problems for Second Order Fully Nonlinear Elliptic Equations. Journal of Partial Differential Equations, [S. l.], v. 3, n. 2, p. 55–62, 1990. Disponível em: https://global-sci.com/index.php/jpde/article/view/3659. Acesso em: 5 dec. 2025.